Walter Millis worked mainly as a newspaperman for the New York Herald Tribune, and wrote books about current affairs, especially world conflicts. In this book he looks at the United States from the time war was declared in Europe in 1914 up until the time the US got involved in the fighting herself. He doesn't much like what he sees.
It is a throughly revisionist history. It makes no bones about its main thesis: that the participation of the U.S. in the First World War was a mistake; that we were dragged into the war through the foolish, wishy-washy policies of the Wilson administration, which spoke neutrality but which favored the British, and whose hypocrisies involved us in the war as a semi-belligerent in the days before April 1917, and led us into direct confrontation, then actual war with the German Empire.